Cross Fit 3 Android: Zeofit IOS: Zeroner (Zeroner health) Main Function 1. GPS (GPS,BEIDOU,GLONASS,GALILEO) 2. Dual-band dual-frequency satellite positioning, more accurate positioning 3. Screen resolution: 466x466 1.43" AMOLED ultra-clear HD screen display 4. Altitude, Barometer, Compass 5. 50M Waterproof 6. Heart Rate, Blood Oxygen, Heart Health, Stress, Sleep Monitoring 7. 130+ Sports mode 8. 20days long battery standby 9. 10+ language APP Function 1. Clock, date display, multi-dial, data storage, OTA upgrade 2. Health functions: heart rate monitoring, sleep monitoring, step counting monitoring, calorie monitoring, standing monitoring, activity time monitoring, distance monitoring, blood oxygen detection, pressure value function 3. Sports exercise (support setting goal reminder): Running/cycling/walking/climbing/basketball/badminton/football/sit-ups/rope skipping/yoga/dancing/aerobics/swimming/tennis/elliptical machine/rowing machine/HIIT Subsequent support for custom sports (100+ sports) 4. Reminder module: call reminder, schedule reminder, SMS notification, application push reminder, alarm clock reminder, sedentary reminder, goal achievement reminder, high heart rate reminder 5. Other functions: altitude barometer, remote camera, music control, do not disturb mode, flashlight, compass, stopwatch, timer, 12/24 hour switching, brightness adjustment, factory reset, firmware information, manual date and time setting, shutdown Specification 1. Screen: 1.43 amoled 466*466 2. Resolution: 466*466 3. Full Touch Screen 4. Bluetooth 5.0 5. Battery Capacity:580mAh/2.204Wh 5. Waterproof : 50M 7. Charge Time: 2 Hours 8. Standby Time: 20days 9. Material: Plastic+ Alloy Language: Russian，English, German, Spanish, French, Italian, Japanese, Portuguese, Simplified Chinese, Traditional Chinese Why my gps has no signal and can't connect successfully？ Cross Fit 3 is a watch with built-in GPS. Before using it for the first time, you must connect to the app to obtain agps and assist positioning. For subsequent use, if the positioning location is changed, it is recommended to update it again, and the trajectory will be more accurate Parameter Description Main chip：MTK2523D+3335 watch case ：PC Bezel：Metal alloy size：47x13mm weight：50g Wrist circumference：150mm-240mm sensor：Heart rate. GPS. accelerometer.ABC(altimeterbarometerMeter and compass) sensor screen：1.43"AMOLED color round screen resolving power：466 * 466 pixels Battery：580mAh polymer lithium battery Standby duration：20 days Charging port：Magnetic charging Waterproof grade：50M Charging time：About 2 hours Bluetooth：BLE5.0 support system： IOS 10.0/Android 5.0 or above